Examples of org.apache.hadoop.hbase.RegionLocations

org.apache.hadoop.hbase.RegionLocations
Container for holding a list of {@link HRegionLocation}'s that correspond to the same range. The list is indexed by the replicaId. This is an immutable list, however mutation operations are provided which returns a new List via copy-on-write (assuming small number of locations)

          for (int i = 1; i < numReplicas; i++) {
            replicasToClose.add(RegionReplicaUtil.getRegionInfoForReplica(merge, i));
          }
        }
      }
      RegionLocations rl =  MetaTableAccessor.getRegionLocations(result);
      if (rl == null) continue;
      HRegionLocation[] locations = rl.getRegionLocations();
      if (locations == null) continue;
      for (HRegionLocation hrl : locations) {
        HRegionInfo regionInfo = hrl.getRegionInfo();
        if (regionInfo == null) continue;
        int replicaId = regionInfo.getReplicaId();

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  private void replicateUsingCallable(ClusterConnection connection, Queue<HLog.Entry> entries)
      throws IOException, RuntimeException {
    HLog.Entry entry;
    while ((entry = entries.poll()) != null) {
      byte[] row = entry.getEdit().getCells().get(0).getRow();
      RegionLocations locations = connection.locateRegion(tableName, row, true, true);
      RegionReplicaReplayCallable callable = new RegionReplicaReplayCallable(connection,
        RpcControllerFactory.instantiate(connection.getConfiguration()),
        table.getName(), locations.getRegionLocation(1),
        locations.getRegionLocation(1).getRegionInfo(), row, Lists.newArrayList(entry),
        new AtomicLong());


      RpcRetryingCallerFactory factory = RpcRetryingCallerFactory.instantiate(
        connection.getConfiguration());
      factory.<ReplicateWALEntryResponse> newCaller().callWithRetries(callable, 10000);

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      }


      List<Result> metaRows = MetaTableAccessor.fullScanOfMeta(admin.getConnection());
      int numRows = 0;
      for (Result result : metaRows) {
        RegionLocations locations = MetaTableAccessor.getRegionLocations(result);
        HRegionInfo hri = locations.getRegionLocation().getRegionInfo();
        if (!hri.getTable().equals(table)) continue;
        numRows += 1;
        HRegionLocation[] servers = locations.getRegionLocations();
        // have two locations for the replicas of a region, and the locations should be different
        assert(servers.length == 2);
        assert(!servers[0].equals(servers[1]));
      }
      assert(numRows == numRegions);

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        get.addColumn(HConstants.CATALOG_FAMILY, MetaTableAccessor.getServerColumn(i));
        get.addColumn(HConstants.CATALOG_FAMILY, MetaTableAccessor.getStartCodeColumn(i));
      }
    }
    Result r = meta.get(get);
    RegionLocations rl = MetaTableAccessor.getRegionLocations(r);
    if (rl == null) {
      LOG.warn("Unable to close region " + hi.getRegionNameAsString() +
          " since meta does not have handle to reach it");
      return;
    }
    for (HRegionLocation h : rl.getRegionLocations()) {
      ServerName serverName = h.getServerName();
      if (serverName == null) {
        errors.reportError("Unable to close region "
            + hi.getRegionNameAsString() +  " because meta does not "
            + "have handle to reach it.");

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      public boolean processRow(Result result) throws IOException {
        try {


          // record the latest modification of this META record
          long ts =  Collections.max(result.listCells(), comp).getTimestamp();
          RegionLocations rl = MetaTableAccessor.getRegionLocations(result);
          if (rl == null) {
            emptyRegionInfoQualifiers.add(result);
            errors.reportError(ERROR_CODE.EMPTY_META_CELL,
              "Empty REGIONINFO_QUALIFIER found in hbase:meta");
            return true;
          }
          ServerName sn = null;
          if (rl.getRegionLocation(HRegionInfo.DEFAULT_REPLICA_ID) == null ||
              rl.getRegionLocation(HRegionInfo.DEFAULT_REPLICA_ID).getRegionInfo() == null) {
            emptyRegionInfoQualifiers.add(result);
            errors.reportError(ERROR_CODE.EMPTY_META_CELL,
              "Empty REGIONINFO_QUALIFIER found in hbase:meta");
            return true;
          }
          HRegionInfo hri = rl.getRegionLocation(HRegionInfo.DEFAULT_REPLICA_ID).getRegionInfo();
          if (!(isTableIncluded(hri.getTable())
              || hri.isMetaRegion())) {
            return true;
          }
          PairOfSameType<HRegionInfo> daughters = HRegionInfo.getDaughterRegions(result);
          for (HRegionLocation h : rl.getRegionLocations()) {
            if (h == null || h.getRegionInfo() == null) {
              continue;
            }
            sn = h.getServerName();
            hri = h.getRegionInfo();

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        public boolean processRow(Result result) throws IOException {
          if (result == null || result.isEmpty()) {
            return true;
          }


          RegionLocations locations = MetaTableAccessor.getRegionLocations(result);
          if (locations == null) return true;
          for (HRegionLocation loc : locations.getRegionLocations()) {
            if (loc != null) {
              HRegionInfo regionInfo = loc.getRegionInfo();
              // If region offline AND we are not to include offlined regions, return.
              if (regionInfo.isOffline() && !offlined) continue;
              regions.add(regionInfo);

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    final NavigableMap<HRegionInfo, ServerName> regions =
      new TreeMap<HRegionInfo, ServerName>();
    MetaScannerVisitor visitor = new TableMetaScannerVisitor(tableName) {
      @Override
      public boolean processRowInternal(Result result) throws IOException {
        RegionLocations locations = MetaTableAccessor.getRegionLocations(result);
        if (locations == null) return true;
        for (HRegionLocation loc : locations.getRegionLocations()) {
          if (loc != null) {
            HRegionInfo regionInfo = loc.getRegionInfo();
            regions.put(new UnmodifyableHRegionInfo(regionInfo), loc.getServerName());
          }
        }

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      Connection connection, final TableName tableName) throws IOException {
    final List<RegionLocations> regions = new ArrayList<RegionLocations>();
    MetaScannerVisitor visitor = new TableMetaScannerVisitor(tableName) {
      @Override
      public boolean processRowInternal(Result result) throws IOException {
        RegionLocations locations = MetaTableAccessor.getRegionLocations(result);
        if (locations == null) return true;
        regions.add(locations);
        return true;
      }
    };

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